[GFS2] possible null pointer dereference fixup
Cyrill Gorcunov [Mon, 3 Mar 2008 18:54:21 +0000 (21:54 +0300)]
gfs2_alloc_get may fail so we have to check it to prevent
NULL pointer dereference.

Signed-off-by: Cyrill Gorcunov <gorcunov@gamil.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/bmap.c
fs/gfs2/dir.c
fs/gfs2/eattr.c
fs/gfs2/inode.c
fs/gfs2/ops_address.c
fs/gfs2/ops_inode.c
fs/gfs2/quota.c

index c1ee635..f7093aa 100644 (file)
@@ -900,6 +900,8 @@ static int do_grow(struct gfs2_inode *ip, u64 size)
        int error;
 
        al = gfs2_alloc_get(ip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
@@ -1081,7 +1083,8 @@ static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
                lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
 
        find_metapath(sdp, lblock, &mp, ip->i_height);
-       gfs2_alloc_get(ip);
+       if (!gfs2_alloc_get(ip))
+               return -ENOMEM;
 
        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
index a3753c7..94070ad 100644 (file)
@@ -1868,11 +1868,14 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
        if (!ht)
                return -ENOMEM;
 
-       gfs2_alloc_get(dip);
+       if (!gfs2_alloc_get(dip)) {
+               error = -ENOMEM;
+               goto out;
+       }
 
        error = gfs2_quota_hold(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
-               goto out;
+               goto out_put;
 
        error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh);
        if (error)
@@ -1946,8 +1949,9 @@ out_rlist:
        gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh);
 out_qs:
        gfs2_quota_unhold(dip);
-out:
+out_put:
        gfs2_alloc_put(dip);
+out:
        kfree(ht);
        return error;
 }
index 76ead1a..288d5e6 100644 (file)
@@ -318,6 +318,8 @@ static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
        int error;
 
        al = gfs2_alloc_get(ip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
@@ -681,6 +683,8 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
        int error;
 
        al = gfs2_alloc_get(ip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
@@ -1464,6 +1468,8 @@ int gfs2_ea_dealloc(struct gfs2_inode *ip)
        int error;
 
        al = gfs2_alloc_get(ip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
index 92ea9af..dcae2aa 100644 (file)
@@ -351,6 +351,8 @@ int gfs2_dinode_dealloc(struct gfs2_inode *ip)
        }
 
        al = gfs2_alloc_get(ip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
@@ -825,7 +827,8 @@ static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
        int error;
 
        munge_mode_uid_gid(dip, &mode, &uid, &gid);
-       gfs2_alloc_get(dip);
+       if (!gfs2_alloc_get(dip))
+               return -ENOMEM;
 
        error = gfs2_quota_lock(dip, uid, gid);
        if (error)
@@ -860,6 +863,8 @@ static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
        int error;
 
        al = gfs2_alloc_get(dip);
+       if (!al)
+               return -ENOMEM;
 
        error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
        if (error)
index fbb4a6a..2483d87 100644 (file)
@@ -649,6 +649,10 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 
        if (alloc_required) {
                al = gfs2_alloc_get(ip);
+               if (!al) {
+                       error = -ENOMEM;
+                       goto out_unlock;
+               }
 
                error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
                if (error)
index 6cbbb5b..34fe571 100644 (file)
@@ -200,6 +200,10 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 
        if (alloc_required) {
                struct gfs2_alloc *al = gfs2_alloc_get(dip);
+               if (!al) {
+                       error = -ENOMEM;
+                       goto out_gunlock;
+               }
 
                error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
                if (error)
@@ -716,6 +720,10 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 
        if (alloc_required) {
                struct gfs2_alloc *al = gfs2_alloc_get(ndip);
+               if (!al) {
+                       error = -ENOMEM;
+                       goto out_gunlock;
+               }
 
                error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
                if (error)
@@ -953,7 +961,8 @@ static int setattr_chown(struct inode *inode, struct iattr *attr)
        if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
                ogid = ngid = NO_QUOTA_CHANGE;
 
-       gfs2_alloc_get(ip);
+       if (!gfs2_alloc_get(ip))
+               return -ENOMEM;
 
        error = gfs2_quota_lock(ip, nuid, ngid);
        if (error)
index a08dabd..636bccf 100644 (file)
@@ -617,8 +617,9 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
        int err = -EIO;
 
        if (gfs2_is_stuffed(ip)) {
-               struct gfs2_alloc *al = NULL;
-               al = gfs2_alloc_get(ip);
+               struct gfs2_alloc *al = gfs2_alloc_get(ip);
+               if (!al)
+                       return -ENOMEM;
                /* just request 1 blk */
                al->al_requested = 1;
                gfs2_inplace_reserve(ip);
@@ -729,6 +730,10 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 
        if (nalloc) {
                al = gfs2_alloc_get(ip);
+               if (!al) {
+                       error = -ENOMEM;
+                       goto out_gunlock;
+               }
 
                al->al_requested = nalloc * (data_blocks + ind_blocks);